﻿//===============================================================================
// Microsoft patterns & practices Enterprise Library
// Core
//===============================================================================
// Copyright © Microsoft Corporation.  All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE.
//===============================================================================

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Practices.EnterpriseLibrary.Common.Configuration.Storage;
using System.IO;

namespace Microsoft.Practices.EnterpriseLibrary.Common.Configuration
{
	/// <summary>
	/// Reacts to changes on the medium on which a set of configuration sections are serialized.
	/// </summary>
	public abstract class ConfigurationSourceWatcher : IDisposable
	{
		private string configurationSource;
		private IList<string> watchedSections;

		/// <summary>
		/// The watcher on the underlying medium.
		/// </summary>
		protected ConfigurationChangeWatcher configWatcher = null;

		/// <summary>
		/// Initializes a new instance of the <see cref="ConfigurationSourceWatcher"/> class.
		/// </summary>
		/// <param name="configSource">The identification of the medium.</param>
		/// <param name="refresh"><b>true</b> if changes should be notified, <b>false</b> otherwise.</param>
		/// <param name="changed">The callback for changes notification.</param>
		public ConfigurationSourceWatcher(string configSource, bool refresh, ConfigurationChangedEventHandler changed)
		{
			this.configurationSource = configSource;
			this.watchedSections = new List<string>();
		}
		/// <summary>
		/// Gets or sets the identification of the medium where the watched set of configuration sections is stored.
		/// </summary>
		public string ConfigSource
		{
			get { return configurationSource; }
			set { configurationSource = value; }
		}

		/// <summary>
		/// Gets or sets the collection of watched sections.
		/// </summary>
		public IList<string> WatchedSections
		{
			get { return watchedSections; }
			set { watchedSections = value; }
		}

		/// <summary>
		/// Starts watching for changes on the serialization medium.
		/// </summary>
		public void StartWatching()
		{
			if (this.configWatcher != null)
			{
				this.configWatcher.StartWatching();
			}
		}

		/// <summary>
		/// Stops watching for changes on the serialization medium.
		/// </summary>
		public void StopWatching()
		{
			if (this.configWatcher != null)
			{
				this.configWatcher.StopWatching();
			}
		}

		/// <summary>
		/// Gets the watcher over the serialization medium.
		/// </summary>
		public ConfigurationChangeWatcher Watcher
		{
			get { return this.configWatcher; }
		}


		void IDisposable.Dispose()
		{
			if (this.configWatcher != null)
			{
				this.configWatcher.Dispose();
			}
		}
	}
}
